Flat Down Flat

***First of all dont give me hate messages for not puttin this up on build-a-jib cause i did before i put this up and it wasn't any help*** so here it is... Im thinkin about makin a flat down flat for my backyard... i already have a 15 footer made from 2 PVC's (check my pics) and i wasn't sure how long the dimesions should, be how much of an angle for the kink, and if i should use PVC again, ect... plaese help me out

to start build-a-jib cult.
second, use pvc the whole way so theres no speed changes.
make it in 3 sections, you might not even need a down rail, just use somthing to prop it up.
im to lazy to answer the rest/